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New clang option -mpie-copy-relocations to use copy relocations for PIE builds. 

Differential Revision: https://reviews.llvm.org/D19996

llvm-svn: 284638
This commit is contained in:
Sriraman Tallam 2016-10-19 20:24:06 +00:00
parent 9ca9a31948
commit 165a8845f8
5 changed files with 17 additions and 0 deletions
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4
clang/include/clang/Driver/Options.td
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@ -1691,6 +1691,10 @@ def mno_implicit_float : Flag<["-"], "mno-implicit-float">, Group<m_Group>,
def mimplicit_float : Flag<["-"], "mimplicit-float">, Group<m_Group>;
def mrecip : Flag<["-"], "mrecip">, Group<m_Group>;
def mrecip_EQ : CommaJoined<["-"], "mrecip=">, Group<m_Group>, Flags<[CC1Option]>;
def mpie_copy_relocations : Flag<["-"], "mpie-copy-relocations">, Group<m_Group>,
Flags<[CC1Option]>,
HelpText<"Use copy relocations support for PIE builds">;
def mno_pie_copy_relocations : Flag<["-"], "mno-pie-copy-relocations">, Group<m_Group>;
def mx87 : Flag<["-"], "mx87">, Group<m_x86_Features_Group>;
def m80387 : Flag<["-"], "m80387">, Alias<mx87>;
def msse2 : Flag<["-"], "msse2">, Group<m_x86_Features_Group>;

3
clang/include/clang/Frontend/CodeGenOptions.def
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@ -252,6 +252,9 @@ VALUE_CODEGENOPT(EmitCheckPathComponentsToStrip, 32, 0)
/// Whether to report the hotness of the code region for optimization remarks.
CODEGENOPT(DiagnosticsWithHotness, 1, 0)
/// Whether copy relocations support is available when building as PIE.
CODEGENOPT(PIECopyRelocations, 1, 0)
#undef CODEGENOPT
#undef ENUM_CODEGENOPT
#undef VALUE_CODEGENOPT

2
clang/lib/CodeGen/BackendUtil.cpp
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@ -595,6 +595,8 @@ void EmitAssemblyHelper::CreateTargetMachine(bool MustCreateTM) {
Options.MCOptions.MCNoExecStack = CodeGenOpts.NoExecStack;
Options.MCOptions.MCIncrementalLinkerCompatible =
CodeGenOpts.IncrementalLinkerCompatible;
Options.MCOptions.MCPIECopyRelocations =
CodeGenOpts.PIECopyRelocations;
Options.MCOptions.MCFatalWarnings = CodeGenOpts.FatalWarnings;
Options.MCOptions.AsmVerbose = CodeGenOpts.AsmVerbose;
Options.MCOptions.PreserveAsmComments = CodeGenOpts.PreserveAsmComments;

6
clang/lib/Driver/Tools.cpp
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@ -4499,6 +4499,12 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
CmdArgs.push_back("-mms-bitfields");
}
if (Args.hasFlag(options::OPT_mpie_copy_relocations,
options::OPT_mno_pie_copy_relocations,
false)) {
CmdArgs.push_back("-mpie-copy-relocations");
}
// This is a coarse approximation of what llvm-gcc actually does, both
// -fasynchronous-unwind-tables and -fnon-call-exceptions interact in more
// complicated ways.

2
clang/lib/Frontend/CompilerInvocation.cpp
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@ -586,6 +586,8 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
Opts.IncrementalLinkerCompatible =
Args.hasArg(OPT_mincremental_linker_compatible);
Opts.PIECopyRelocations =
Args.hasArg(OPT_mpie_copy_relocations);
Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);